PowerPoint Presentation Inspection Quality of Surface Treatment Coating thickness measurement • Fischer Handheld coating thickness gauges 2 Fischer thickness gauge measurement 1 Switch on 2 Select app.
Inspection Quality of Surface Treatment Coating thickness measurement • Fischer Handheld coating thickness gauges Fischer thickness gauge measurement Switch on Select application file Perform a normalization -Measure times on the uncoated reference part (base material) and press ENTER key to finish the normalization Calibration -Place the calibration foil on the uncoated reference part, measure on several point within the foil circle(calibration foil 1), adjust calibration value Repeat calibration steps with calibration foil Press ENTER key to finish Start measurement the sample thickness -Measure on several points on sample area LAB LAB color space describes mathematically all perceivable colors in the three dimensions L for lightness A for color-opponents green-red B for the color-opponents blue-yellow For Black color: focus on “L” value For non black color: focus on “A, B” value Quality of sealing measurement • Dye stain tests: B136 − 84 (Reapproved 2008)E1 Procedure: Apply a drop of HNO3 (40±5 mass%) on test area , min, temp 25 oC Wash with running water and dry with clean cloth Apply a drop of dye solution, min, temp 25 oC Wash with running water, rub with pumice powder and a clean cloth wet with water , temp 25 oC Observe dye stain in the test area Quality of sealing measurement • Weight loss test: ISO 3210:2010(E) Consists of two methods Method 1: Immersion in phosphoric acid/chromic acid solution, without prior acid treatment Decorative or protective purposes Method 2: Immersion in phosphoric acid/chromic acid solution with prior acid treatment Architectural purposes Not applicable for: ⎯ hard coat type which not sealed ⎯ sealed in dichromate solutions ⎯ produced in chromic acid solutions ⎯ undergone hydrophobic treatment Fastness measurement - UV Fastness: ISO 6581:2010(E): most colored anodized finishes will show significant color changes in exposure times of less than 100 hr - Heat Fastness: 1hr, 200 oC - Sun light Fastness: ~ 100 hr Accelerated corrosion testing • Relating factors: Film thickness: Thickness increase, Corrosion resistance increase Alloy composition: Inter-metallic particles which are dissolved in anodizing Quality of sealing: This is primarily of importance for retention of appearance Accelerated corrosion testing · Salt spray test: ASTM B117-03 ltems Concentration of sodium chloride solution pH During the test 5±1 parts by mass of NaCl in 95 parts of water 6.5 to 7.2 Pressure Of Compressed air kgf/cm2 (kPa) Quantity Of Spray (ml/80 cm2/h) 0.7 to 1.7 (69 to 167) 1.0 to 2.0 Temperature of air saturating container ( °c) 47 ± Temperature of salt water tank ( °c) 35 ± Temperature of test chamber ( °c) 35 ± 0.053*Mass of water = Mass of NaCl required Accelerated corrosion testing NaCl conc Analysis: Pipette sample 10 ml Add DI or RO water 40 ml Drop 3-5 drops of 10% NaCrO4 indicator Titrate with 0.1 AgNO3 Calculation: NaCl = vol of 0.1 AgNO3 * 5.844 % corrosion = corrosion area(cm) * 100 Total sample area(cm) Accelerated corrosion testing · Acetic Acid Salt Spray: ASTM G85 annex A1 ltems Concentration of sodium chloride solution Acetic acid (ml/l) pH Pressure Of Compressed air kgf/cm2 (kPa) Quantity Of Spray (ml/80 cm2/h) During the test 5±1 parts by mass of NaCl in 95 parts of water 10 3.1 to 3.3 0.7 to 1.7 (69 to 167) 1.0 to 2.0 Temperature of air saturating container ( °c) 47 ± Temperature of salt water tank ( °c) 35 ± Temperature of chamber ( °c) 35 ± Accelerated corrosion testing · The CASS Test (Copper-Accelerated Acetic Acid-Salt Spray ): ASTM B 368 – 97 ltems Concentration of sodium chloride solution Copper chloride solution (g/l) pH Pressure Of Compressed air kgf/cm2 (kPa) Quantity Of Spray (ml/80 cm2/h) During the test 5±1 parts by mass of NaCl in 95 parts of water 0.25 3.1 to 3.3 0.7 to 1.7 (69 to 167) 1.0 to 2.0 Temperature of air saturating container ( °c) 60-65 Temperature of salt water tank ( °c) 49 ± Temperature of chamber ( °c) 49 ± Water Immersion Test This test is used for the detection of free iron or any other anodic surface contaminants on stainless steel Procedure: Immerse sample part in a non-rusting tank of distilled water for hr and allowed to dry in air for hr Repeat this cycle for minimum 12 times The sample part shall not exhibit rust or staining High Humidity Test This test is used for the detection of free iron or any other anodic surface contaminants on stainless steel Procedure: Cleaning sample part by immersion in acetone or methyl alcohol and dry in atmosphere The test shall be performed using humidity cabinet with condition 97±3% at 100±5 oF (38 ±3)oC for minimum of 24 hr The sample part shall not exhibit rust or staining Copper Sulfate Test This test is used for the detection of free iron on the surface of austenitic stainless steel Procedure: Test solution: Dissolving g of copper sulfate pentahydrate (CuSO4·5H2O) in 250 ml of distilled water and add ml sulfuric acid (sp.gr 1.84) Swabbing test solution on the surface of the sample, applying additional solution as needed to keep the surface wet for at least At the end point, rinsing and drying sample part carefully, not to disturb copper deposits if present The test sample should not exhibit copper deposits Thank you for your attention 16